Gonna Be The Twin-Tail!! Vol. 20 (Light Novel)

In Vol. 20, with their long battle against the Ultimegil finally over, peace has returned to the world. Aside from having to battle stray Elemarians, the Twintails return to their daily life. Excited to enjoy their peaceful days to the fullest, Soji and the others make plans for a summer camp. But the battle proves to be not yet over when an unknown Elemarian who threatens the world with its very existence suddenly attacks. Will the Twintails be able to protect the world one last time from this powerful twintailed monster?
Notice: This book is written in Japanese.